IEA SHC Task 61/EBC Annex 77: Integrated Solutions for Daylighting and Electric Lighting

Lighting accounts for around 15% of global electricity consumption - intelligent coordination of daylighting and electric lighting solutions together with integral lighting controls enable significant energy savings. At the same time, the solutions must be optimally planned in a user-centered approach based on the visual and non-visual effects of light. The task analysed user requirements as well as existing technologies and design methods and documented exemplary implementations in case studies.

Short Description

The IEA SHC Task 61/EBC Annex 77 aimed to identify potentials for the integration of daylighting and electric lighting solutions and corresponding control approaches in order to achieve the highest energy efficiency of lighting solutions and to realize optimal lighting conditions for users. Over a period of 3½ years, 55 international experts from 37 research institutes, universities, and companies from 17 countries from the fields of daylighting, artificial lighting and lighting controls worked together in the Task.

The Task dealt with general lighting in indoor environments, focusing on applications in non-residential buildings. It addressed the integration of

  • daylight utilization through innovative facade systems and architectural solutions,
  • electric lighting solutions using new technologies and design approaches, and
  • lighting controls and control strategies with a special focus on visual and non-visual (biological) user requirements and on the interface between daylight and electric light.

User requirements were collected, taking into account visual and non-visual needs. The results were combined into typical user and time profiles, so-called "personas". The state of the art in lighting controls was surveyed, and new developments were analysed and examined for their future potential. A generally accepted scheme for characterizing daylighting systems did not yet exist on the market.

Therefore, one of the main objectives was to compare existing approaches and to work out a uniform methodology. Furthermore, up to now there was no hourly based evaluation procedure for lighting systems, although this is already common practice in many other trades in the building sector. Such a procedure was elaborated, which now covers daylighting, electric lighting and also lighting control systems. In order to be able to make statements about the performance of installed integral lighting solutions, a monitoring protocol was elaborated and applied and tested in numerous case studies.

The Task results are available in reports and can be accessed via the program website. The procedure for characterizing daylighting systems was elaborated in a white paper as preliminary work for a draft standard, and the hourly based evaluation procedure was prepared as an addition in the course of the revision of ISO 10916.


  • Task reports on "Personas for user-centered integral lighting solutions", "Integration and optimization of daylighting and electric lighting", "Workflows in the design process of integral lighting solutions", "Integral lighting solutions in practice"
  • Fact sheets on case studies of realized projects with integral lighting solutions
  • Characterization procedure for daylighting systems.
  • Standardization: Work item on the revision of ISO10916 to add the hour-based, integral assessment procedure
  • VR decision support
  • Web tool for hour-based energy calculation for lighting

Austrian contributions

  • Management of Subtask C "Design Support for Practitioners (Tools, Standards, Guidelines)"
  • Elaboration of visual and non-visual user requirements for lighting
  • Summary of the state of the art in the field of integrative daylighting and electric lighting controls
  • Elaboration of a white paper as preliminary work for a draft standard on the characterization of daylighting systems
  • Austrian case study: documentation and monitoring of an integrative daylighting and electric lighting solution in the R&D office at Bartenbach
  • Preparation of the daylight calculation method as part of the integral hourly evaluation method


Austria, Belgium, Brazil, China, Denmark, Germany, Italy, Japan, Netherlands, Norway, Singapore, Slovakia, Sweden, Switzerland, USA

Contact Address

Project lead:

Bartenbach GmbH
Dr. David Geisler-Moroder
Rinner Str. 14, 6071 Aldrans

Project partner:

Hella Sonnen- und Wetterschutztechnik GmbH
Mag. Robert Weitlaner, MSc.
A-9913 Abfaltersbach 125